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The original item was published from 9/21/2023 10:38:57 AM to 10/12/2023 12:00:03 AM.

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Public Health

Posted on: September 21, 2023

[ARCHIVED] Massachusetts COVID-19 Vaccine Bulletin


Massachusetts COVID-19 Vaccine Bulletin - Week of 9/14/2023

Latest News:

  • All individuals aged 6 months and older are advised to receive the 2023–2024 COVID-19 vaccine, which contains the XBB component, to safeguard against severe COVID-19 during the upcoming fall and winter.

  • Bivalent Moderna and Pfizer-BioNTech COVID-19 vaccines are no longer authorized for use in the U.S. New Pfizer and Moderna vaccines, targeting current variants, are available.

  • ACIP and CDC recommend the 2023–2024 COVID-19 vaccine for individuals ≥6 months of age.

An updated Novavax vaccine is not yet available. Authorizations or approvals for 2023 – 2024 Novavax COVID-19 vaccine will be determined by FDA (anticipated soon) with CDC recommendations to follow shortly thereafter.

On 9/11/2023, the FDA approved and authorized updated Moderna and Pfizer COVID-19 vaccines formulated to more closely target currently circulating variants and to provide better protection against serious consequences of COVID-19, including hospitalization and death.  These vaccines have been updated to include a monovalent (single) component that corresponds to the Omicron variant XBB.1.5.


On 9/12/2023, ACIP recommended 2023–2024 (monovalent, XBB containing) COVID-19 vaccines as authorized under Emergency Use Authorization (EUA) or approved by Biologics License Application (BLA) in persons ≥6 months of age. A short time later, CDC Director Mandy Cohen signed off on the recommendation.


Please watch all resources (ie., CDC,, AAP), for updated materials and clinical guidance.


2023 – 2024 (monovalent, XBB containing) mRNA COVID-19 vaccine recommendations:

·         Everyone ages 5 years and older is recommended to receive 1 dose of a 2023–2024 mRNA COVID-19 vaccine

·         Children ages 6 months–4 years should complete a multi-dose initial series (2 doses of Moderna or 3 doses of Pfizer-BioNTech mRNA COVID-19 vaccine) with at least one dose of the 2023–2024 COVID-19 vaccine

·         People who are moderately or severely immunocompromised should complete a 3- dose initial series with at least one dose of the 2023–2024 COVID-19 vaccine and may receive 1 or more additional 2023–2024 COVID-19 vaccine doses

·         Bivalent mRNA COVID-19 vaccines are no longer recommended in the United States

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